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  9. Q90

RRB NTPC 2026 · Question 90 of 93

The mean of the first twelve prime numbers is:

  1. A16.42Correct
  2. B12.00
  3. C20.45
  4. D10.50

Answer: A. 16.42

Explanation

Given: We need to find the mean of the first twelve prime numbers. Formula Used: Sum of the numbers Mean = ​ Number of numbers ​ Solution: Sum of these prime numbers: 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 = 197 197 Mean = ≈ 16.42​ 12 ​

Source: RRB NTPC CBT-I Memory-Based Paper 16 March 2026 S1 (careerpower test-platform compilation) · memory-based

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